a word often used by people who are insecure about themselves so they call everyone but themselves and their so called "friends" "posers". in my area, it is mostly used by skater kids whose pants are way too tight to describe someone who wears skateboard shoes (etnies, dc, vans etc) but doesn't skate. by that logic, people who wear running shoes but don't run are "posers", people who wear nike basketball shoes but don't play basketball are "posers", people who wear adidas stan smiths but don't play tennis are "posers", the list goes on. the funny thing is, most of these people who call other people "posers" can't spell poseur correctly. yes, there are people who are, in fact, poseurs, but a lot of the people who get called "posers" don't deserve it.

Situation 1, poseur calls someone a "poser":

Bill: DO U SK8?!!?? UR WEARIN NIKE 6.0'S

Joe: That's none of your fucking business.

Bill: O MY GOD U R A FUKIN POSER!!!!!!!!!!!11111

Joe: Dude, by your logic, people who wear New Balance but don't run are "posers".

Any one who does not follow his/her own ideas of what he/she likes. Following no one set norm makes you real and following no one set norm makes you poser. Poser is governed not by the clothes, music, or makeup you wear, but rather by the state of your mind and the conformity to your own beliefs.

a person - usually in middle or high school, who is insecure about him/herself and trys very hard not to be a "conformist" or a "prep," by doing things like: purchasing a skateboard or guitar, purchasing a great deal of clothing and accessories from hot topic, and listening to pop-punk bands such as simple plan, yellowcard, etc. usually, this supposedly "nonconformist" behavior just backfires on him/her, because now he/she is still conforming, just to a different group of people. so the moral of the story is to be yourself.

Someone whos acts like someone theyre not,but not realizing that there being fake, basically a loser trying to fit in.

A poser green day fan,this applies to other poser bands--
Todd:have you heard american idiot?Thats the bestest song ever!
Bill:Have u even heard any other green day songs?
Todd:what other green day songs?

A poser is someone who tries hard to be something they arent. Usually, posers call other people posers because they are jealous that the person they called a poser is more skater/stoner/goth/punk/rocker/grunge/etc. than they will ever be.